How to Access Yammer Across GCC High and GCC Tenants with B2B
Question details
Determine if users within a GCC High tenant can utilize Azure AD B2B collaboration to access Yammer networks hosted in a separate GCC tenant.
- Product
- Yammer / Microsoft 365
- Device & OS
- not provided
- Scenario
- Administrators or users are attempting to collaborate across different government cloud environments (GCC High and GCC) using Yammer communities.
- Observed behavior
- Users want to establish Azure AD B2B guest access to cross-tenant Yammer networks but need clarity on compatibility and restrictions.
Ensure you have Global Administrator or External Identity Provider permissions in Azure AD to configure cross-tenant collaboration, and verify that cross-cloud B2B communication is permitted under your organization's compliance policies.
Enable Yammer Access via Azure AD B2B Collaboration
Configure your Azure AD cross-tenant access settings to allow invitations between your GCC and GCC High environments, enabling guest access to Yammer.
Azure AD B2B guests are generally capable of accessing Yammer networks and communities hosted in another tenant. However, because GCC and GCC High operate in distinct cloud environments with strict security boundaries, explicit cross-tenant trusts must be configured.
Log in to the Azure portal of the host GCC tenant using an account with Global Administrator privileges.
Go to Azure Active Directory, select 'External Identities' from the left-hand menu, and click on 'Cross-tenant access settings'.
Click 'Add organization' and enter the tenant ID or domain name of the GCC High tenant. Configure the inbound and outbound trust settings to allow B2B collaboration between the specific Microsoft clouds.
Navigate to 'Users', click 'New guest user', and send invitations to the GCC High users. Once they redeem the invitation, they can sign into the host tenant's Yammer network using their GCC High credentials.
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Frequently Asked Questions
Why can't my GCC High guest user see files in the GCC Yammer community?
If the Yammer community is connected to a Microsoft 365 Group, file storage relies on SharePoint. Cross-cloud B2B guests often face architectural limitations accessing SharePoint resources in a different cloud boundary (like GCC to GCC High) unless specific SharePoint external sharing settings are also configured.
Is a separate Yammer license required for a GCC High user accessing a GCC network?
No. Azure AD B2B guests access the host tenant's Yammer network using the host's external collaboration licensing model (typically a 1:5 ratio for Azure AD premium features). The guest user does not require an additional Yammer license assigned within the host tenant.
Can I use Yammer external groups instead of Azure AD B2B?
While traditional Yammer external groups allow cross-tenant communication in commercial environments, they are frequently disabled or heavily restricted in government environments (GCC/GCC High) for compliance reasons. Azure AD B2B is the recommended and more secure pathway for cross-tenant identity management.
